1 //===-- IA64ISelLowering.cpp - IA64 DAG Lowering Implementation -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the IA64ISelLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "IA64ISelLowering.h"
15 #include "IA64MachineFunctionInfo.h"
16 #include "IA64TargetMachine.h"
17 #include "llvm/CodeGen/MachineFrameInfo.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
20 #include "llvm/CodeGen/SelectionDAG.h"
21 #include "llvm/CodeGen/MachineRegisterInfo.h"
22 #include "llvm/Constants.h"
23 #include "llvm/Function.h"
26 IA64TargetLowering::IA64TargetLowering(TargetMachine &TM)
27 : TargetLowering(TM) {
29 // register class for general registers
30 addRegisterClass(MVT::i64, IA64::GRRegisterClass);
32 // register class for FP registers
33 addRegisterClass(MVT::f64, IA64::FPRegisterClass);
35 // register class for predicate registers
36 addRegisterClass(MVT::i1, IA64::PRRegisterClass);
38 setLoadExtAction(ISD::EXTLOAD , MVT::i1 , Promote);
40 setLoadExtAction(ISD::ZEXTLOAD , MVT::i1 , Promote);
42 setLoadExtAction(ISD::SEXTLOAD , MVT::i1 , Promote);
43 setLoadExtAction(ISD::SEXTLOAD , MVT::i8 , Expand);
44 setLoadExtAction(ISD::SEXTLOAD , MVT::i16 , Expand);
45 setLoadExtAction(ISD::SEXTLOAD , MVT::i32 , Expand);
47 setOperationAction(ISD::BRIND , MVT::Other, Expand);
48 setOperationAction(ISD::BR_JT , MVT::Other, Expand);
49 setOperationAction(ISD::BR_CC , MVT::Other, Expand);
50 setOperationAction(ISD::FP_ROUND_INREG , MVT::f32 , Expand);
52 // ia64 uses SELECT not SELECT_CC
53 setOperationAction(ISD::SELECT_CC , MVT::Other, Expand);
55 // We need to handle ISD::RET for void functions ourselves,
56 // so we get a chance to restore ar.pfs before adding a
58 setOperationAction(ISD::RET, MVT::Other, Custom);
60 setShiftAmountType(MVT::i64);
62 setOperationAction(ISD::FREM , MVT::f32 , Expand);
63 setOperationAction(ISD::FREM , MVT::f64 , Expand);
65 setOperationAction(ISD::UREM , MVT::f32 , Expand);
66 setOperationAction(ISD::UREM , MVT::f64 , Expand);
68 setOperationAction(ISD::MEMBARRIER , MVT::Other, Expand);
70 setOperationAction(ISD::SINT_TO_FP , MVT::i1 , Promote);
71 setOperationAction(ISD::UINT_TO_FP , MVT::i1 , Promote);
73 // We don't support sin/cos/sqrt/pow
74 setOperationAction(ISD::FSIN , MVT::f64, Expand);
75 setOperationAction(ISD::FCOS , MVT::f64, Expand);
76 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
77 setOperationAction(ISD::FPOW , MVT::f64, Expand);
78 setOperationAction(ISD::FSIN , MVT::f32, Expand);
79 setOperationAction(ISD::FCOS , MVT::f32, Expand);
80 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
81 setOperationAction(ISD::FPOW , MVT::f32, Expand);
83 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
85 // FIXME: IA64 supports fcopysign natively!
86 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
87 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
89 // We don't have line number support yet.
90 setOperationAction(ISD::DBG_STOPPOINT, MVT::Other, Expand);
91 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
92 setOperationAction(ISD::DBG_LABEL, MVT::Other, Expand);
93 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
95 // IA64 has ctlz in the form of the 'fnorm' instruction. The Legalizer
96 // expansion for ctlz/cttz in terms of ctpop is much larger, but lower
98 // FIXME: Custom lower CTLZ when compiling for size?
99 setOperationAction(ISD::CTLZ , MVT::i64 , Expand);
100 setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
101 setOperationAction(ISD::ROTL , MVT::i64 , Expand);
102 setOperationAction(ISD::ROTR , MVT::i64 , Expand);
104 // FIXME: IA64 has this, but is not implemented. should be mux @rev
105 setOperationAction(ISD::BSWAP, MVT::i64 , Expand);
107 // VASTART needs to be custom lowered to use the VarArgsFrameIndex
108 setOperationAction(ISD::VAARG , MVT::Other, Custom);
109 setOperationAction(ISD::VASTART , MVT::Other, Custom);
111 // FIXME: These should be legal
112 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Expand);
113 setOperationAction(ISD::BIT_CONVERT, MVT::f64, Expand);
115 // Use the default implementation.
116 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
117 setOperationAction(ISD::VAEND , MVT::Other, Expand);
118 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
119 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
120 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
122 // Thread Local Storage
123 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
125 setStackPointerRegisterToSaveRestore(IA64::r12);
127 setJumpBufSize(704); // on ia64-linux, jmp_bufs are 704 bytes..
128 setJumpBufAlignment(16); // ...and must be 16-byte aligned
130 computeRegisterProperties();
132 addLegalFPImmediate(APFloat(+0.0));
133 addLegalFPImmediate(APFloat(-0.0));
134 addLegalFPImmediate(APFloat(+1.0));
135 addLegalFPImmediate(APFloat(-1.0));
138 const char *IA64TargetLowering::getTargetNodeName(unsigned Opcode) const {
141 case IA64ISD::GETFD: return "IA64ISD::GETFD";
142 case IA64ISD::BRCALL: return "IA64ISD::BRCALL";
143 case IA64ISD::RET_FLAG: return "IA64ISD::RET_FLAG";
147 MVT IA64TargetLowering::getSetCCResultType(MVT VT) const {
151 void IA64TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG,
152 SmallVectorImpl<SDValue> &ArgValues,
155 // add beautiful description of IA64 stack frame format
156 // here (from intel 24535803.pdf most likely)
158 MachineFunction &MF = DAG.getMachineFunction();
159 MachineFrameInfo *MFI = MF.getFrameInfo();
160 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
162 GP = MF.getRegInfo().createVirtualRegister(getRegClassFor(MVT::i64));
163 SP = MF.getRegInfo().createVirtualRegister(getRegClassFor(MVT::i64));
164 RP = MF.getRegInfo().createVirtualRegister(getRegClassFor(MVT::i64));
166 MachineBasicBlock& BB = MF.front();
168 unsigned args_int[] = {IA64::r32, IA64::r33, IA64::r34, IA64::r35,
169 IA64::r36, IA64::r37, IA64::r38, IA64::r39};
171 unsigned args_FP[] = {IA64::F8, IA64::F9, IA64::F10, IA64::F11,
172 IA64::F12,IA64::F13,IA64::F14, IA64::F15};
178 unsigned used_FPArgs = 0; // how many FP args have been used so far?
180 unsigned ArgOffset = 0;
183 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I)
185 SDValue newroot, argt;
186 if(count < 8) { // need to fix this logic? maybe.
188 switch (getValueType(I->getType()).getSimpleVT()) {
190 assert(0 && "ERROR in LowerArgs: can't lower this type of arg.\n");
192 // fixme? (well, will need to for weird FP structy stuff,
193 // see intel ABI docs)
195 //XXX BuildMI(&BB, IA64::IDEF, 0, args_FP[used_FPArgs]);
196 MF.getRegInfo().addLiveIn(args_FP[used_FPArgs]);
197 // mark this reg as liveIn
198 // floating point args go into f8..f15 as-needed, the increment
199 argVreg[count] = // is below..:
200 MF.getRegInfo().createVirtualRegister(getRegClassFor(MVT::f64));
201 // FP args go into f8..f15 as needed: (hence the ++)
202 argPreg[count] = args_FP[used_FPArgs++];
203 argOpc[count] = IA64::FMOV;
204 argt = newroot = DAG.getCopyFromReg(DAG.getRoot(), dl,
205 argVreg[count], MVT::f64);
206 if (I->getType() == Type::FloatTy)
207 argt = DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, argt,
208 DAG.getIntPtrConstant(0));
210 case MVT::i1: // NOTE: as far as C abi stuff goes,
211 // bools are just boring old ints
216 //XXX BuildMI(&BB, IA64::IDEF, 0, args_int[count]);
217 MF.getRegInfo().addLiveIn(args_int[count]);
218 // mark this register as liveIn
220 MF.getRegInfo().createVirtualRegister(getRegClassFor(MVT::i64));
221 argPreg[count] = args_int[count];
222 argOpc[count] = IA64::MOV;
224 DAG.getCopyFromReg(DAG.getRoot(), dl, argVreg[count], MVT::i64);
225 if ( getValueType(I->getType()) != MVT::i64)
226 argt = DAG.getNode(ISD::TRUNCATE, dl, getValueType(I->getType()),
230 } else { // more than 8 args go into the frame
231 // Create the frame index object for this incoming parameter...
232 ArgOffset = 16 + 8 * (count - 8);
233 int FI = MFI->CreateFixedObject(8, ArgOffset);
235 // Create the SelectionDAG nodes corresponding to a load
236 //from this parameter
237 SDValue FIN = DAG.getFrameIndex(FI, MVT::i64);
238 argt = newroot = DAG.getLoad(getValueType(I->getType()), dl,
239 DAG.getEntryNode(), FIN, NULL, 0);
242 DAG.setRoot(newroot.getValue(1));
243 ArgValues.push_back(argt);
247 // Create a vreg to hold the output of (what will become)
248 // the "alloc" instruction
249 VirtGPR = MF.getRegInfo().createVirtualRegister(getRegClassFor(MVT::i64));
250 BuildMI(&BB, dl, TII->get(IA64::PSEUDO_ALLOC), VirtGPR);
251 // we create a PSEUDO_ALLOC (pseudo)instruction for now
253 BuildMI(&BB, IA64::IDEF, 0, IA64::r1);
256 BuildMI(&BB, IA64::IDEF, 0, IA64::r12);
257 BuildMI(&BB, IA64::IDEF, 0, IA64::rp);
260 BuildMI(&BB, IA64::MOV, 1, GP).addReg(IA64::r1);
263 BuildMI(&BB, IA64::MOV, 1, SP).addReg(IA64::r12);
264 BuildMI(&BB, IA64::MOV, 1, RP).addReg(IA64::rp);
268 unsigned tempOffset=0;
270 // if this is a varargs function, we simply lower llvm.va_start by
271 // pointing to the first entry
274 VarArgsFrameIndex = MFI->CreateFixedObject(8, tempOffset);
277 // here we actually do the moving of args, and store them to the stack
278 // too if this is a varargs function:
279 for (int i = 0; i < count && i < 8; ++i) {
280 BuildMI(&BB, dl, TII->get(argOpc[i]), argVreg[i]).addReg(argPreg[i]);
282 // if this is a varargs function, we copy the input registers to the stack
283 int FI = MFI->CreateFixedObject(8, tempOffset);
284 tempOffset+=8; //XXX: is it safe to use r22 like this?
285 BuildMI(&BB, dl, TII->get(IA64::MOV), IA64::r22).addFrameIndex(FI);
286 // FIXME: we should use st8.spill here, one day
287 BuildMI(&BB, dl, TII->get(IA64::ST8), IA64::r22).addReg(argPreg[i]);
291 // Finally, inform the code generator which regs we return values in.
292 // (see the ISD::RET: case in the instruction selector)
293 switch (getValueType(F.getReturnType()).getSimpleVT()) {
294 default: assert(0 && "i have no idea where to return this type!");
295 case MVT::isVoid: break;
301 MF.getRegInfo().addLiveOut(IA64::r8);
305 MF.getRegInfo().addLiveOut(IA64::F8);
310 std::pair<SDValue, SDValue>
311 IA64TargetLowering::LowerCallTo(SDValue Chain, const Type *RetTy,
312 bool RetSExt, bool RetZExt, bool isVarArg,
313 bool isInreg, unsigned CallingConv,
314 bool isTailCall, SDValue Callee,
315 ArgListTy &Args, SelectionDAG &DAG,
318 MachineFunction &MF = DAG.getMachineFunction();
320 unsigned NumBytes = 16;
321 unsigned outRegsUsed = 0;
323 if (Args.size() > 8) {
324 NumBytes += (Args.size() - 8) * 8;
327 outRegsUsed = Args.size();
330 // FIXME? this WILL fail if we ever try to pass around an arg that
331 // consumes more than a single output slot (a 'real' double, int128
332 // some sort of aggregate etc.), as we'll underestimate how many 'outX'
333 // registers we use. Hopefully, the assembler will notice.
334 MF.getInfo<IA64FunctionInfo>()->outRegsUsed=
335 std::max(outRegsUsed, MF.getInfo<IA64FunctionInfo>()->outRegsUsed);
337 // keep stack frame 16-byte aligned
338 // assert(NumBytes==((NumBytes+15) & ~15) &&
339 // "stack frame not 16-byte aligned!");
340 NumBytes = (NumBytes+15) & ~15;
342 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
345 std::vector<SDValue> Stores;
346 std::vector<SDValue> Converts;
347 std::vector<SDValue> RegValuesToPass;
348 unsigned ArgOffset = 16;
350 for (unsigned i = 0, e = Args.size(); i != e; ++i)
352 SDValue Val = Args[i].Node;
353 MVT ObjectVT = Val.getValueType();
354 SDValue ValToStore(0, 0), ValToConvert(0, 0);
356 switch (ObjectVT.getSimpleVT()) {
357 default: assert(0 && "unexpected argument type!");
362 //promote to 64-bits, sign/zero extending based on type
364 ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
366 ExtendKind = ISD::SIGN_EXTEND;
367 else if (Args[i].isZExt)
368 ExtendKind = ISD::ZERO_EXTEND;
369 Val = DAG.getNode(ExtendKind, dl, MVT::i64, Val);
374 if(RegValuesToPass.size() >= 8) {
377 RegValuesToPass.push_back(Val);
382 Val = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Val);
385 if(RegValuesToPass.size() >= 8) {
388 RegValuesToPass.push_back(Val);
389 if(1 /* TODO: if(calling external or varadic function)*/ ) {
390 ValToConvert = Val; // additionally pass this FP value as an int
396 if(ValToStore.getNode()) {
397 if(!StackPtr.getNode()) {
398 StackPtr = DAG.getRegister(IA64::r12, MVT::i64);
400 SDValue PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
401 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i64, StackPtr, PtrOff);
402 Stores.push_back(DAG.getStore(Chain, dl, ValToStore, PtrOff, NULL, 0));
403 ArgOffset += ObjSize;
406 if(ValToConvert.getNode()) {
407 Converts.push_back(DAG.getNode(IA64ISD::GETFD, dl,
408 MVT::i64, ValToConvert));
412 // Emit all stores, make sure they occur before any copies into physregs.
414 Chain = DAG.getNode(ISD::TokenFactor, dl,
415 MVT::Other, &Stores[0],Stores.size());
417 static const unsigned IntArgRegs[] = {
418 IA64::out0, IA64::out1, IA64::out2, IA64::out3,
419 IA64::out4, IA64::out5, IA64::out6, IA64::out7
422 static const unsigned FPArgRegs[] = {
423 IA64::F8, IA64::F9, IA64::F10, IA64::F11,
424 IA64::F12, IA64::F13, IA64::F14, IA64::F15
429 // save the current GP, SP and RP : FIXME: do we need to do all 3 always?
430 SDValue GPBeforeCall = DAG.getCopyFromReg(Chain, dl, IA64::r1,
432 Chain = GPBeforeCall.getValue(1);
433 InFlag = Chain.getValue(2);
434 SDValue SPBeforeCall = DAG.getCopyFromReg(Chain, dl, IA64::r12,
436 Chain = SPBeforeCall.getValue(1);
437 InFlag = Chain.getValue(2);
438 SDValue RPBeforeCall = DAG.getCopyFromReg(Chain, dl, IA64::rp,
440 Chain = RPBeforeCall.getValue(1);
441 InFlag = Chain.getValue(2);
443 // Build a sequence of copy-to-reg nodes chained together with token chain
444 // and flag operands which copy the outgoing integer args into regs out[0-7]
445 // mapped 1:1 and the FP args into regs F8-F15 "lazily"
446 // TODO: for performance, we should only copy FP args into int regs when we
447 // know this is required (i.e. for varardic or external (unknown) functions)
449 // first to the FP->(integer representation) conversions, these are
450 // flagged for now, but shouldn't have to be (TODO)
451 unsigned seenConverts = 0;
452 for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
453 if(RegValuesToPass[i].getValueType().isFloatingPoint()) {
454 Chain = DAG.getCopyToReg(Chain, dl, IntArgRegs[i],
455 Converts[seenConverts++], InFlag);
456 InFlag = Chain.getValue(1);
460 // next copy args into the usual places, these are flagged
461 unsigned usedFPArgs = 0;
462 for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
463 Chain = DAG.getCopyToReg(Chain, dl,
464 RegValuesToPass[i].getValueType().isInteger() ?
465 IntArgRegs[i] : FPArgRegs[usedFPArgs++], RegValuesToPass[i], InFlag);
466 InFlag = Chain.getValue(1);
469 // If the callee is a GlobalAddress node (quite common, every direct call is)
470 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
472 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
473 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i64);
477 std::vector<MVT> NodeTys;
478 std::vector<SDValue> CallOperands;
479 NodeTys.push_back(MVT::Other); // Returns a chain
480 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
481 CallOperands.push_back(Chain);
482 CallOperands.push_back(Callee);
484 // emit the call itself
485 if (InFlag.getNode())
486 CallOperands.push_back(InFlag);
488 assert(0 && "this should never happen!\n");
490 // to make way for a hack:
491 Chain = DAG.getNode(IA64ISD::BRCALL, dl, NodeTys,
492 &CallOperands[0], CallOperands.size());
493 InFlag = Chain.getValue(1);
495 // restore the GP, SP and RP after the call
496 Chain = DAG.getCopyToReg(Chain, dl, IA64::r1, GPBeforeCall, InFlag);
497 InFlag = Chain.getValue(1);
498 Chain = DAG.getCopyToReg(Chain, dl, IA64::r12, SPBeforeCall, InFlag);
499 InFlag = Chain.getValue(1);
500 Chain = DAG.getCopyToReg(Chain, dl, IA64::rp, RPBeforeCall, InFlag);
501 InFlag = Chain.getValue(1);
503 std::vector<MVT> RetVals;
504 RetVals.push_back(MVT::Other);
505 RetVals.push_back(MVT::Flag);
507 MVT RetTyVT = getValueType(RetTy);
509 if (RetTyVT != MVT::isVoid) {
510 switch (RetTyVT.getSimpleVT()) {
511 default: assert(0 && "Unknown value type to return!");
512 case MVT::i1: { // bools are just like other integers (returned in r8)
513 // we *could* fall through to the truncate below, but this saves a
514 // few redundant predicate ops
515 SDValue boolInR8 = DAG.getCopyFromReg(Chain, dl, IA64::r8,
517 InFlag = boolInR8.getValue(2);
518 Chain = boolInR8.getValue(1);
519 SDValue zeroReg = DAG.getCopyFromReg(Chain, dl, IA64::r0,
521 InFlag = zeroReg.getValue(2);
522 Chain = zeroReg.getValue(1);
524 RetVal = DAG.getSetCC(dl, MVT::i1, boolInR8, zeroReg, ISD::SETNE);
530 RetVal = DAG.getCopyFromReg(Chain, dl, IA64::r8, MVT::i64, InFlag);
531 Chain = RetVal.getValue(1);
533 // keep track of whether it is sign or zero extended (todo: bools?)
535 RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext :ISD::AssertZext,
536 dl, MVT::i64, RetVal, DAG.getValueType(RetTyVT));
538 RetVal = DAG.getNode(ISD::TRUNCATE, dl, RetTyVT, RetVal);
541 RetVal = DAG.getCopyFromReg(Chain, dl, IA64::r8, MVT::i64, InFlag);
542 Chain = RetVal.getValue(1);
543 InFlag = RetVal.getValue(2); // XXX dead
546 RetVal = DAG.getCopyFromReg(Chain, dl, IA64::F8, MVT::f64, InFlag);
547 Chain = RetVal.getValue(1);
548 RetVal = DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, RetVal,
549 DAG.getIntPtrConstant(0));
552 RetVal = DAG.getCopyFromReg(Chain, dl, IA64::F8, MVT::f64, InFlag);
553 Chain = RetVal.getValue(1);
554 InFlag = RetVal.getValue(2); // XXX dead
559 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
560 DAG.getIntPtrConstant(0, true), SDValue());
561 return std::make_pair(RetVal, Chain);
564 SDValue IA64TargetLowering::
565 LowerOperation(SDValue Op, SelectionDAG &DAG) {
566 DebugLoc dl = Op.getDebugLoc();
567 switch (Op.getOpcode()) {
568 default: assert(0 && "Should not custom lower this!");
569 case ISD::GlobalTLSAddress:
570 assert(0 && "TLS not implemented for IA64.");
572 SDValue AR_PFSVal, Copy;
574 switch(Op.getNumOperands()) {
576 assert(0 && "Do not know how to return this many arguments!");
579 AR_PFSVal = DAG.getCopyFromReg(Op.getOperand(0), dl, VirtGPR, MVT::i64);
580 AR_PFSVal = DAG.getCopyToReg(AR_PFSVal.getValue(1), dl, IA64::AR_PFS,
582 return DAG.getNode(IA64ISD::RET_FLAG, dl, MVT::Other, AR_PFSVal);
584 // Copy the result into the output register & restore ar.pfs
585 MVT ArgVT = Op.getOperand(1).getValueType();
586 unsigned ArgReg = ArgVT.isInteger() ? IA64::r8 : IA64::F8;
588 AR_PFSVal = DAG.getCopyFromReg(Op.getOperand(0), dl, VirtGPR, MVT::i64);
589 Copy = DAG.getCopyToReg(AR_PFSVal.getValue(1), dl, ArgReg,
590 Op.getOperand(1), SDValue());
591 AR_PFSVal = DAG.getCopyToReg(Copy.getValue(0), dl,
592 IA64::AR_PFS, AR_PFSVal, Copy.getValue(1));
593 return DAG.getNode(IA64ISD::RET_FLAG, dl, MVT::Other,
594 AR_PFSVal, AR_PFSVal.getValue(1));
600 MVT VT = getPointerTy();
601 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
602 SDValue VAList = DAG.getLoad(VT, dl, Op.getOperand(0), Op.getOperand(1),
604 // Increment the pointer, VAList, to the next vaarg
605 SDValue VAIncr = DAG.getNode(ISD::ADD, dl, VT, VAList,
606 DAG.getConstant(VT.getSizeInBits()/8,
608 // Store the incremented VAList to the legalized pointer
609 VAIncr = DAG.getStore(VAList.getValue(1), dl, VAIncr,
610 Op.getOperand(1), SV, 0);
611 // Load the actual argument out of the pointer VAList
612 return DAG.getLoad(Op.getValueType(), dl, VAIncr, VAList, NULL, 0);
615 // vastart just stores the address of the VarArgsFrameIndex slot into the
616 // memory location argument.
617 SDValue FR = DAG.getFrameIndex(VarArgsFrameIndex, MVT::i64);
618 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
619 return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1), SV, 0);
621 // Frame & Return address. Currently unimplemented
622 case ISD::RETURNADDR: break;
623 case ISD::FRAMEADDR: break;